<?php

namespace wechat;

use function GuzzleHttp\json_encode;

header('content-type:application:json;charset=utf8');  
header('Access-Control-Allow-Origin:*');  
header('Access-Control-Allow-Credentials:true');  
header('Access-Control-Allow-Methods:*');  
header('Access-Control-Allow-Headers:x-requested-with,content-type'); 
class JSSDK
{
    private $appId;
    private $appSecret;

    public function __construct($appId, $appSecret)
    {
        $this->appId = $appId;
        $this->appSecret = $appSecret;
    }

    public function getSignPackage($urls)
    {
        $jsapiTicket = $this->getJsApiTicket();
        //var_dump($jsapiTicket);
        //$url = urldecode("http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]");
        $url = urldecode($urls);
        $timestamp = time();
        $nonceStr = $this->createNonceStr();

// 这里参数的顺序要按照 key 值 ASCII 码升序排序
        $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";

        $signature = sha1($string);

        $signPackage = array(
            "appId" => $this->appId,
            "nonceStr" => $nonceStr,
            "timestamp" => $timestamp,
            "url" => $url,
            "signature" => $signature,
            "rawString" => $string,
        );
        return $signPackage;
    }

    private function createNonceStr($length = 16)
    {
        $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }

    private function getJsApiTicket()
    {
// jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
        // $data = json_decode(file_get_contents("jsapi_ticket.json"));
        // if ($data->expire_time < time()) {
        //     $accessToken = $this->getAccessToken();
        //     $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
            $url = 'http://m.happyvalleytj.smartoct.com/weixinmp-controller/mpservice/getJsapiTicket.json?type=jsapi&id=hudongli&secret=tuf1cs6lnokcunp7';
            $res = $this->httpGet($url);
            
            //$ticket = $res->ticket; //服务器，在本地会报错的，必须上传到服务器
             $ticket = $res['ticket']; //本地
        //     if ($ticket) {
        //         $data->expire_time = time() + 7000;
        //         $data->jsapi_ticket = $ticket;
        //         $fp = fopen("jsapi_ticket.json", "w");
        //         fwrite($fp, json_encode($data));
        //         fclose($fp);
        //     }
        // } else {
        //     $ticket = $data->jsapi_ticket;
        // }
        return $ticket;
    }

    private function getAccessToken()
    {
// access_token 应该全局存储与更新，以下代码以写入到文件中做示例
        // $data = json_decode(file_get_contents("access_token.json"));
        // if ($data->expire_time < time()) {
        //     $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={$this->appId}&secret={$this->appSecret}";
            $url = 'http://m.happyvalleytj.smartoct.com/weixinmp-controller/mpservice/getWechatAccessToken.json?id=hudongli&secret=tuf1cs6lnokcunp7';
            $res = $this->httpGet($url);
            //var_dump($url);
            //$access_token = $res->access_token; //服务器，在本地会报错的，必须上传到服务器
            $access_token = $res['access_token']; //本地
        //     if ($access_token) {
        //         $data->expire_time = time() + 7000;
        //         $data->access_token = $access_token;
        //         $fp = fopen("access_token.json", "w");
        //         fwrite($fp, json_encode($data));
        //         fclose($fp);
        //     }
        // } else {
        //     $access_token = $data->access_token;
        // }
        return $access_token;
    }

    private function httpGet($url)
    {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $AjaxReturn = curl_exec($curl);
        //获取access_token和openid,转换为数组
        $res = json_decode($AjaxReturn,true);
        curl_close($curl);
        //var_dump($AjaxReturn);
        return $res;
        
    }
}
